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    <meta charset="UTF-8">
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    <title>八进制和十六进制</title>
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    <!-- 如果前缀为 0，则 JavaScript 会把数值常量解释为八进制数，如果前缀为 0 和 "x"，则解释为十六进制数。 -->
    <script>
        var y = 0377;
        var z = 0xFF;
        document.write(y + "<br />");
        document.write(z + "<br />");
    </script>
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